package com.zcl.javaClassAndObject.inheritance.上溯造型;

/**
 * @Description:
 * @author: zcl
 * @date: 2021/12/10  13:44
 */
public class Instrument {
    public void play() {
    }

    static void tune(Instrument i) {
        // ...
        i.play();
    }
}
